sedimentary
Agate
Silicon dioxide (chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, translucent to opaque with banded or mottled patterns, specific gravity of 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, translucent to opaque with banded or mottled patterns, specific gravity of 2.60 to 2.65.
Formation & geological history
Formed by the deposition of silica from groundwater in cavities of igneous or sedimentary rocks, typically over millions of years in volcanic regions.
Uses & applications
Used in ornamental objects, jewelry, carvings, and scientific instruments like mortar and pestles due to its durability.
Geological facts
Agate is one of the most popular materials used in art carving and lapidary work. Ancient civilizations used it for talismans and seals.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and characteristic banding or layered appearance. Found worldwide, particularly in Brazil, Uruguay, India, and parts of the United States like Oregon.
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